Electric-arc lamp.



2 Sheets-Sheet l.

Patented Jan. 29, l90l.

FLEMING. ELECTRIC ARC LAMP.

(Application filed Nov. 12, 1900.)

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1 I l l l ll IIII I l /E Richard Flemin No. 667,|22. Patent ed Jan. 29,190l.

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ELECTRIC ARC LAMP.

(Application filed Nov. 12, 1900.) (NolodeL) 2 Sheets-Sheet 2.

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UNITED STATES PATENT OFFICE.

RICHARD FLEMING, OF SWAMPSCOTT, MASSACHUSETTS, ASSIGNOR TO THE GENERAL ELECTRIC COMPANY, OF NEW YORK.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 667,122, dated January 29, 1901.

Application filed November 12, 1900. Serial No. 36,166. (No model.)

To aZZ whom it may concern: maintained in circuit at the same time, owing Be it known that I. RICHARD FLEMING, a to the transformer action which takes place. subject of the Queen of Great Britain, resid- To obviate this diiiioulty and at the same time ing at Swampscott, county of Essex, State of economize in space and in the cost of con- 55 Massachusetts, have invented certain new struction, I arrange the operating parts of the and usefulImprovements inArc-Lamps,(Case lamp in such manner that when the series No. 1,336,) of which the following is a speciwinding is in circuit the shunt-winding is fication. open-circuited. Conversely, when the shunt- The present invention relates to arc-lamps, winding is in circuit the series winding is 60 1o andmore particularly to those of the alteropen-circuited. This will be more fully denating inclosed-arc type intended for use on scribed hereinafter. series circuits of constant current; but it is Two actuated magnets F and G are prowithin the scope of my invention to use the vided, and wound on each of these spools is lamps on constant-potential alternating-cura fine-Wire or shunt winding H and a coarse- 65 I5 rent circuits. wire or series winding I. Both the shunt and The present invention has for its object to series windings of the separate magnets are improve the construction and operation of alconnected in series. The spools for the magternating-curreut arc-lamps. nets are made of fibrous insulating material In the accompanying drawings, which illusin order to decrease the humming consequent 7o trate my invention, Figure 1 is a side elevato the operation of alternating-current lamps. tion .of the lamp with the casing removed. The heads of the magnets are constructed as Fig. 2 is a front elevation. Figs. 3, 4, and 5 illustrated in Figs. 3 and 4. Referring to the are detail views of the means employed for figures, J represents the cut-away portion to supporting the actuated magnets. Fig. 6 is receive the frame-tube A, and J are lugs, 75 .25 a diagram of the circuit connections, and Fig. through which extend the rods K, Figs. 1 and 7 is a side elevation of a contact-controlling 5. These rods are arranged to pass through magnet. both the upper and lower heads of the spools Extending vertically through the center of and retain the same in place. Secured to the the lamp is a frame-tube A, within which the frame-tube A by small screws is a frame L, 80 upper carbon B is free to move under the concomprising a vertically-extending piece havtrol of the clutch C. Secured to and insuing a pair of end plates L and L The forlated from the upper end of the tube A is a mer is located above the upper head of the head D. Secured to the lower end of the tube magnet and the latter below the lower head. is a base E for supporting certain of the mi- Passing through the plates and through the 85 nor parts of the lamp. heads of the magnets are bolts K. The lower The lamp illustrated is of the shunt-feed ends of the bolts are screw-threaded, while type. In addition to the shunt-winding a sethe upper ends are provided with slots after ries coil is provided for striking the are at the the manner of an ordinary screw. By taking time the lamp is started into operation. In out these rods the magnets may readily be re- 0 order to render the lamp as simple in conmoved.

struction as possible, the shunt and series In addition to forming a support for the rewindings are mounted on the same spools. In taining-rods K the lower plate L forms a supdirect-current lamps the shunt and series port for the laminated U-shaped stationary windings can both be included in circuit at magnet-core M. The movable magnet-core 95 one and the same time. This is also true of N is also U-shaped, and the legs extend into alternating-current lamps when the windings the spools, as illustrated by the dotted lines. are placed on separate spools and are arranged To the upper end of the moving core is seto act differentially on the actuated mechancured a flat spring-plate 0, having a projecism; but when the windings are placed on the tion thereon, to which the clutch-rod P is se- I00 same spool or spools andin inductive relation cured. This rod passes downward through to each other the two windings cannot be the upper and lower magnet-heads and also through the base of the lamp and is guided thereby. The spring connection between the core and the rod is such that it will reduce vibrations to a minimum.

In order to steady the action of the lamp, adash-pot Q is provided, one portion of which is secured to the rod P through an arm P, and the other portion is secured to the base of the lamp. For the purpose of separating and holding the carbons apart when the lamp is idle an extension-spring R is provided, the lower end of which is connected to the arm P, while the upper end is adjustably secured to the arm S, the latter being adjustably clamped to the frametube A. Mounted on the base of the lamp and included in series with the arc is a magnet T. This magnet is arranged to operate an armature T, which carries a contact T Adjustably mounted on the side frame of the lamp, Fig. 2, and located over the armature T is a contact Y, which is connected to one end of the shuntwinding. Located below the armature and adjustably secured to the side rod of the lamp is the contact IV, which is connected to one en d of the series winding. The space between the contacts Y and XV is great enough so that the moving contact on the armature T breaks the circuit at one point before making the circuit at a second point. The action of this magnet will be described in connection with Fig. 6. In order to cut the lamp out when for any reason the lamp fails to feed, a contact-carrying arm U is rigidly secured to the clutch-rod P, and the contact carried by the arm is arranged to bridge the contacts U".

Referring to Fig. 6, the circuits of the lamp will be described. Assuming that the carbons are separated (the normal condition) and current is turned on the lamp, its path will be as follows: from the binding-post V through the series wound magnets I, and thence to the contact \V through the contact T and flexible connection to the binding-post X. The core N will now be attracted, pulling the carbons into contact and striking the arc. Immediately the are is formed the magnet T, on account of its being in series with the arc, becomes energized and separates the contact T from the contact W and moves it into engagement with the contact Y, which completes the circuit of the shunt-winding II. The feeding is now under the control of the shunt-winding, and as the are gradually consumes the carbons the clutch C gradually lowers until it strikes the tripping-platform Z, Fig. 2, when the carbon is permitted to feed a certain amount. This action continues until the carbons are consumed. If during the operation of the lamp anything happens to interrupt the regularity of the feed, the series coil will strike the are again, and the operation will continue as before.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In an electric-arc lamp, designed for use on alternating-cnrrent circuits, the combination of two regulatingwin dings both of which are mounted on the same spool and are in inductive relation to each other, which windings are never included in circuit at one and the same time, with means for interrupting the'circuit of one of the said magnets before the circuit of the other is completed.

2. In'an alternating-current arc-lamp, the combination of a shunt and a series winding mounted on the same spool, which windings are never included in circuit at one and the same time, with an electromagnet included in series relation with the are for interrupting the circuit of the series coil before the circuit of the shunt-coil is completed.

8. In an alternating-current arc lamp, the combination of a shunt and a series winding, a spool made out of fiber on which the windings are wound, a stationary U-shaped core the legs of which extend into the spool, a movable U-shaped core the legs of which also extend into the magnet, an electromagnet included in series with the arc, and a contact controlled by the last-mentioned magnet for making and breaking the circuits of both the shunt and the series magnets.

i. In an electric-arc lamp, the combination of a frame, a pair of magnets, a head therefor having projections and a slot for receiving the frame, supporting-plates secured to the frame above and below the magnets and rods which pass downward through the projections on the magnet spool-heads and hold the same in position.

5. In an electric-arc lamp, the combination of a central frame-tube, a pair of magnets, and a frame for supporting the magnets which consists of a main body portion which is secured to the frame-tube and provided with top and bottom plates or lugs, and a pair of rods which pass through said lugs for retaining the magnets in place.

(3. In an alternating-current arc-lamp, the combination of a spool, a shuntwinding mounted thereon,a series winding also mount-- ed thereon and in an inductive relation to the shunt-winding, which windings are never included in circuit at one and the same time, an electromagnet for closing the circuit of one of the windings, and gravity-controlled means for closing the circuit of the other winding.

'7. In an arc-lamp, the combination of an actuating-magnet, a core mounted for movement within the magnet, a clutch, a clutchrod, and a spring between the clutch-rod and the magnet-core consisting of a U -shaped piece made out of sheet metal with a projection formed thereon to which the clutch-rod is secured, the legs of the piece being secured to the core.

In witness whereof I have hereunto set my hand this 9th day of November, 1900.

RICHARD FLEMING.

Witnesses:

DUGALD MoKILLoP, JOHN J. WALKER. 

